.bd{
	border: 1px solid red;
}
.w{
	width: 1140px;
	margin: 0 auto;
}
.fl{
	float:left;
}
.fr{
	float: right;
}
.clearfix::before,.clearfix::after{
				content:"";
				display: table;
			}
.clearfix::after{
				clear:both;
			}
